US8858836B2 - Borophosphate phosphor and light source - Google Patents

Borophosphate phosphor and light source Download PDF

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US8858836B2
US8858836B2 US13/881,522 US201113881522A US8858836B2 US 8858836 B2 US8858836 B2 US 8858836B2 US 201113881522 A US201113881522 A US 201113881522A US 8858836 B2 US8858836 B2 US 8858836B2
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phosphor
group
divalent
ion selected
wavelength range
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US20130214673A1 (en
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Cheng-Jun Duan
Sven Roesler
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Leuchtstoffwerk Breitungen GmbH
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/70—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus
    • C09K11/71—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing phosphorus also containing alkaline earth metals
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
    • C09K11/7737—Phosphates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
    • C09K11/774—Borates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
    • C09K11/7795—Phosphates
    • C09K11/7796—Phosphates with alkaline earth metals
    • F21V9/16—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
    • C09K11/7797—Borates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/181—

Definitions

  • This invention is related to efficient inorganic borophosphate phosphors which can applied in various technical applications such as fluorescent lamps, colored light or white light emitting diodes, and other devices where phosphors are used to convert especially near UV radiation into the visible light. Further, this invention is related to light sources comprising the efficient borophosphate phosphor.
  • White LED lighting within a phosphor converted-LED (pc-LED) system can be realized by several approaches: The first approach is to combine the InGaN based blue-LED chip (emitting blue light between 455 nm and 465 nm with a yellow phosphor, i.e., YAG:Ce 3+ or EA 2 SiO 4 :Eu 2+ based materials.
  • the white LED provided by this well known and established method has the disadvantages of poor color rendering when used for general lighting and small color gamut when used for backlighting.
  • the second one is to combine a blue-LED chip with a green-emitting phosphor ( ⁇ max ⁇ 530 nm) and a red-emitting phosphor ( ⁇ max >600 nm) instead of the single yellow-emitting phosphor.
  • the two phosphors absorb the blue light from the InGaN chip and convert it into green and red light and then by color mixing the white light is generated with higher color rendering and larger color gamut.
  • the final color temperature (CCT) and color coordinate of the pc-LED strongly depends on the emission characteristics of the blue-LED chips. As a consequence, in order to get a similar CCT only a part of available blue-LED chips can be used.
  • the third one is to use a near UV-LED chip plus blue, green, and red emitting phosphor.
  • the third one provides improved color rendering and a wide range of color temperatures as well as an independent color coordinate.
  • the disadvantage of this technical solution is the color shift during the life cycle resulting from the different aging rate of the three different phosphors.
  • this white LED has a low luminous efficiency and a poor long-term stability.
  • WO 2006/111568 A2 shows white light emitting non-stoichiometric compounds having a not fixed composition.
  • DE 1 927 455 shows borate phosphate phosphors like Ba 0.995 Eu 0.005 BPO 5 and Sr 0.99 Eu 0.01 BPO 5 that are used in low-pressure mercury discharge lamps. These Eu 2+ -activated MBPO 5 phosphors show a broad emission band in the UV to blue range with a maximum, dependent on the alkaline earth metals present, at 385 nm to 400 nm.
  • WO 2009/036425 A1 shows a phosphor blend for a compact fluorescent lamp comprising LaPO 4 :Ce 3+ , Tb 3+ ; Y 2 O 3 :Eu 3+ ; Sr 6 BP 5 O 20 :Eu 2+ and Mg 4 GeO 5.5 F:Mn 4+ .
  • An object of this invention is to provide improved phosphors that are excitable by a radiation source of the near UV and emit the visible light, especially, as a single phosphor which can emit white light without the request to combine with some other phosphors.
  • a further object is to provide an appropriate light source.
  • FIG. 3 shows temperature dependent luminescence of Eu 2+ -doped KBaBP 2 O 8 ;
  • FIG. 4 shows emission spectra of KBa 1-x Eu x BP 2 O 8 phosphor with different Eu 2+ doping concentrations
  • FIG. 5 shows typical XRD patterns of Eu 2+ -doped K(Ba,Sr)BP 2 O 8 and K(Ba,Ca)BP 2 O 8 phosphors;
  • FIG. 6 shows excitation (inset) and emission spectra of Eu 2+ -doped K(Ba,Sr)Eu 0.03 BP 2 O 8 with different Sr and Ba contents;
  • FIG. 7 shows excitation (inset) and emission spectra of Eu 2+ -doped K(Ba,Ca)Eu 0.03 BP 2 O 8 with different Ca and Ba contents;
  • FIG. 8 shows emission spectra of Eu 2+ -doped KBaBP 2 O 8 partly substituted by Na
  • FIG. 9 shows emission spectra of Eu 2+ -doped KBaBP 2 O 8 partly substituted by Li
  • FIG. 10 shows emission spectra of Eu 2+ -doped KBaBP 2 O 8 partly substituted by Zn.
  • the present invention discloses new borophosphate phosphors that are activated by rare earth ions, preferably by Eu 2+ ions.
  • the inventive phosphor converts radiation. For this, it absorbs radiation in a first wavelength range of the electromagnetic spectrum and emits radiation in a second wavelength range of the electromagnetic spectrum.
  • the first wavelength range of the electromagnetic spectrum differs from the second wavelength range of the electromagnetic spectrum.
  • the inventive borophosphate phosphor is activated with divalent rare earth metal ions. It is represented by the following general formula: AM 1-x RE x BP 2 O 8
  • Symbol A represents at least one univalent alkaline metal ion.
  • Symbol M stands for at least one divalent metal ion.
  • RE is at least one divalent ion selected from the group comprising rare earth metals as well as Pb, Sn, Cu, and Mn.
  • RE contains at least one divalent rare earth metal ion that is acting as an activator.
  • Variable x is limited by 0 ⁇ x ⁇ 1.
  • RE contains at least the divalent rare earth metal ion of Eu, namely Eu 2+ that is acting as activator.
  • RE contains at least the divalent rare earth metal ion of Sm or Yb, namely Sm 2+ or Yb 2+ that is acting as activator.
  • RE further contains at least one divalent ion selected from the group comprising Ce, Yb, Tb, Gd, Dy, and Sm that is acting as a coactivator.
  • RE further contains at least one divalent ion selected from the group comprising Pb, Sn, Cu, and Mn that is acting as a coactivator.
  • Variable x is preferably less than or equal to 0.2; and more preferably less than or equal to 0.1.
  • symbol A represents at least one univalent alkaline metal ion selected from the group comprising Li, K, Na, Rb, and Cs; or more preferably, selected from the group comprising Li, K, and Na.
  • M stands for at least one divalent metal ion selected from the group comprising Ca, Sr, Ba, Be, Mg, and Zn; or more preferably, selected from the group comprising Ca, Sr, and Ba.
  • symbol A stand for potassium K.
  • symbol M represents at least one divalent metal ion selected from the group comprising Ca, Sr, Ba, and Zn.
  • RE contains at least one divalent rare earth metal ion selected from the group comprising Eu, Sm, and Yb that is acting as activator and at least one divalent ion selected from the group comprising Pb, Cu, and Mn.
  • variable x is less than or equal to 0.1.
  • M stands for calcium, barium, strontium, or combinations of these three elements resulting in one of the following formulae: ABa 1-x EU x BP 2 O 8 ; ABa (1-x-y) Sr y EU x BP 2 O 8 ; and ABa (1-x-z) Ca z Eu x BP 2 O 8 ; wherein 0 ⁇ y ⁇ 1.0 and 0 ⁇ z ⁇ 0.3.
  • A is at least one univalent alkaline metal ion selected from the group comprising Li, K, and Na.
  • M stands for Ba.
  • RE represents Eu.
  • Variable x is smaller or equal 0.1.
  • the resulting general formula is: ABa 1-x Eu x BP 2 O 8 .
  • A is preferably K, resulting in the general formula: KBa 1-x Eu x BP 2 O 8 , wherein variable x is more preferably less than or equal to 0.08.
  • symbol A stands for at least one univalent alkaline metal ion selected from the group comprising Li, K, and Na.
  • M consists of Ba and Sr.
  • RE represents Eu.
  • the resulting general formula is: Aba (1-x-y) Sr y Eu x BP 2 O 8 , wherein x ⁇ 0.1, 0 ⁇ y ⁇ 1.0 and (x+y) ⁇ 1.0.
  • A is preferably K, resulting in the general formula: KBa (1-x-y) Sr y EU x BP 2 O 8 , wherein variable x is more preferably less than or equal to 0.08 and y is more preferably less than or equal to 0.4, wherein (x+y) ⁇ 0.5.
  • symbol A stands for at least one univalent alkaline metal ion selected from the group comprising Li, K, and Na. Further M consists of Ba and Ca. RE represents Eu.
  • the resulting general formula is: ABa (1-x-z) Ca z Eu x BP 2 O 8 , wherein x ⁇ 0.1 and 0 ⁇ z ⁇ 0.3.
  • A is preferably K, resulting in the general formula KBa (1-x-z) Ca z Eu x BP 2 O 8 , wherein variable x is more preferably less than or equal to 0.08 and wherein (x+z) ⁇ 0.3.
  • the inventive phosphor shows a strong excitation band in the wavelength range of 250 nm to 420 nm. From there, the first wavelength range ranges preferably from 250 nm to 420 nm; or more preferably from 300 nm to 370 nm.
  • the second wavelength range is preferably the whole visual spectrum, especially in the range from 400 nm to 700 nm, or at least in the range from 420 nm to 600 nm.
  • a peak center of the second wavelength is preferably between 450 nm and 480 nm.
  • the inventive phosphor can be well excited under UV light irradiation and emits blue or white light.
  • the phosphor shows high thermal stability, which is comparable to that of YAG:Ce 3+ phosphor.
  • the phosphor according to the present invention can be used as a radiation converter for the transformation of UV (250 nm to 420 nm) into a longer-wave visible light that well be emitted by the phosphor preferably in blue to orange spectral region.
  • the inventive phosphor can be used in light sources, e.g. in white light emitting light sources.
  • this phosphor can be used in photovoltaic cells, in greenhouse foils, or in greenhouse glasses.
  • the light of the Sun forms the radiation in the first wavelength range of the electromagnetic spectrum.
  • the radiation emitted by the phosphor will be directed to the photovoltaic cells and to the plants in the greenhouse, respectively.
  • the inventive light source comprises an inventive phosphor and a radiation emitting element that emits radiation in the first wavelength range of the electromagnetic spectrum.
  • the phosphor converts the emitted radiation of the first wavelength range into the radiation of the second wavelength range.
  • the radiation emitting element acts as excitation source for the phosphor.
  • the light source emits at least the radiation in the second wavelength range of the phosphor.
  • the light source comprises at least one further phosphor that emits red, yellow, green, and/or blue light in order to improve the performance of the light source.
  • the inventive light source is preferably formed by a fluorescent lamp, by a colored light emitting LED, by a white light emitting LED or by an application based on UV laser or purple laser excitation.
  • the radiation emitting element is preferably formed by high-pressure discharge plasma or by low-pressure discharge plasma, by a UV inorganic light emitting diode (LED) or by a purple-blue inorganic light emitting diode (LED), or by a laser or by a laser diode.
  • the radiation emitting element can be formed by an LED. This encloses different types of inorganic LED like SMD, top-LED, and side-view LED that are having a plastic or ceramic body and incorporating a light emitting element which emits radiation in the first wavelength range, especially; in the UV-A and purple-blue.
  • the luminescent borophosphate phosphor according to the invention can be prepared by means of a solid state reaction at a high temperature of a mixture of oxides of the component elements or compounds which are converted into the corresponding oxides on heating. In general, it is advantageous to heat the starting mixtures in two steps.
  • the product obtained need to be pulverized after cooling after each heating operation.
  • the last heating operation is usually performed in a reducing atmosphere (i.e. 70% N 2 -30% H 2 ) to obtain the europium in the desired bivalent state.
  • a mixture is made of 1.380 g K 2 CO 3 , 4.020 g BaCO 3 , 0.106 g Eu 2 O 3 , 1.298 g H 3 BO 3 and 4.601 g NH 4 H 2 PO 4 .
  • the raw materials were weighted in an agate mortar and homogenously mixed. This mixture was placed in alumina crucibles.
  • the crucibles covered with an alumina plate were heated in a furnace in air for 4 hours at a temperature of 400° C. After cooling and pulverizing, the product was subjected to a heat operation for 8 hour at 900° C. under a flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a mixture is made of 1.380 g K 2 CO 3 , 2.644 g BaCO 3 , 0.886 g SrCO 3 , 0.106 g Eu 2 O 3 , 1.298 g H 3 BO 3 , and 4.601 g NH 4 H 2 PO 4 .
  • This mixture was heated for 4 h in a furnace in air at a temperature of 400° C.
  • the product was subjected to a heat operation for 10 hour at 900° C. under a flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a luminescent materials have a composition defined by the formula KBa 0.67 Sr 0.30 Eu 0.03 BP 2 O 8 was obtained.
  • a mixture is made of 1.380 g K 2 CO 3 , 3.236 g BaCO 3 , 0.300 g CaCO 3 , 0.106 g Eu 2 O 3 , 1.298 g H 3 BO 3 , and 4.601 g NH 4 H 2 PO 4 .
  • This mixture was heated for 6 h in a furnace in air at a temperature of 400° C.
  • the product was subjected to a heat operation for 12 hour at 900° C. under flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a luminescent materials have a composition defined by the formula KBa 0.82 Ca 0.15 Eu 0.03 BP 2 O 8 was obtained.
  • a mixture is made of 1.106 g K 2 CO 3 , 0.202 g Na 2 CO 3 , 3.828 g BaCO 3 , 0.106 g Eu 2 O 3 , 1.298 g H 3 BO 3 , and 4.601 g NH 4 H 2 PO 4 .
  • This mixture was heated for 4 h in a furnace in air at a temperature of 400° C.
  • the product was subjected to a heat operation for 9 hour at 900° C. under a flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a luminescent materials have a composition defined by the formula K 0.8 Na 0.2 Ba 0.97 Eu 0.03 BP 2 O 8 was obtained.
  • the luminescence intensity of the sample is about 120% relative to that of the sample in Example 1 under excitation of 340 nm.
  • a mixture is made of 1.106 g K 2 CO 3 , 0.148 g Li 2 CO 3 , 3.828 g BaCO 3 , 0.106 g Eu 2 O 3 , 1.298 g H 3 BO 3 , and 4.601 g NH 4 H 2 PO 4 .
  • This mixture was heated for 4 h in a furnace in air at a temperature of 400° C.
  • the product was subjected to a heat operation for 9 hour at 900° C. under a flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a luminescent materials have a composition defined by the formula K 0.8 Li 0.2 Ba 0.97 Eu 0.03 BP 2 O 8 was obtained.
  • the luminescence intensity of the sample is about 80% relative to that of the sample in Example 1 under excitation of 340 nm.
  • a mixture is made of 1.382 g K 2 CO 3 , 0.163 g ZnO, 3.434 g BaCO 3 , 0.106 g Eu 2 O 3 , 1.298 g H 3 BO 3 , and 4.601 g NH 4 H 2 PO 4 .
  • This mixture was heated for 4 h in a furnace in air at a temperature of 400° C.
  • the product was subjected to a heat operation for 9 hour at 900° C. under a flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a luminescent materials have a composition defined by the formula KBa 0.87 Zn 0.1 Eu0 .03 BP 2 O 8 was obtained.
  • the luminescence intensity of the sample is about 105% relative to that of the sample in Example 1 under excitation of 340 nm.
  • a mixture is made of 1.382 g K 2 CO 3 , 0.070 g Sm 2 O 3 , 3.710 g BaCO 3 , 0.140 g Eu 2 O 3 , 1.298 g H 3 BO 3 , and 4.601 g NH 4 H 2 PO 4 .
  • This mixture was heated for 4 h in a furnace in air at a temperature of 400° C.
  • the product was subjected to a heat operation for 9 hour at 900° C. under a flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a luminescent materials have a composition defined by the formula K 0.8 Li 0.2 Ba 0.97 Eu 0.03 BP 2 O 8 was obtained.
  • the luminescence intensity of the sample is about 98% relative to that of the sample in Example 1 under excitation of 340 nm.
  • a mixture is made of 1.382 g K 2 CO 3 , 0.078 g Yb 2 O 3 , 3.710 g BaCO 3 , 0.140 g Eu 2 O 3 , 1.298 g H 3 BO 3 , and 4.601 g NH 4 H 2 PO 4 .
  • This mixture was heated for 4 h in a furnace in air at a temperature of 400° C. After cooling and pulverizing, the product was subjected to a heat operation for 9 hour at 900° C. under a flowing 70% N 2 -30% H 2 atmosphere in a covered alumina crucible.
  • a luminescent materials have a composition defined by the formula KBa 0.94 Eu 0.04 Yb 0.02 BP 2 O 8 was obtained.
  • the luminescence intensity of the sample is about 85% relative to that of the sample in Example 1 under excitation of 340 nm.
  • FIG. 3 shows temperature dependence of the luminescence of Eu 2+ -doped KBaBP 2 O 8 phosphor under excitation of 405 nm in comparison to YAG:Ce 3+ .
  • FIG. 5 shows typical XRD patterns of KBa 0.67 Ca 0.3 Eu 0.03 BP 2 O 8 , KBa 0.87 Ca 0.1 Eu 0.03 BP 2 O 8 , and KBa 0.77 Sr 0.2 Eu 0.03 BP 2 O 8 in comparison to KBaBP 2 O 8 and KSrBP 2 O 8 .
  • FIG. 6 shows excitation (inset) and emission spectra of KBa 0.97 Eu 0.03 BP 2 O 8 , KBa 0.87 Sr 0.1 Eu 0.03 BP 2 O 8 , KBa 0.77 Sr 0.2 Eu 0.03 BP 2 O 8 , KBa 0.67 Sr 0.3 Eu 0.03 BP 2 O 8 , and KSr 0.97 Eu 0.03 BP 2 O 8 .
  • FIG. 7 shows excitation (inset) and emission spectra of KBa 0.97 Eu 0.03 BP 2 O 8 , KBa 0.92 Ca 0.05 Eu 0.03 BP 2 O 8 , KBa 0.87 Ca 0.1 Eu 0.03 BP 2 O 8 , KBa 0.82 Ca 0.15 Eu 0.03 BP 2 O 8 , and KBa 0.67 Ca 0.3 Eu 0.03 BP 2 O 8 .
  • FIG. 8 shows emission spectra of Eu 2+ -doped KBaBP 2 O 8 and in the case when K is partly substituted by Na.
  • FIG. 9 shows emission spectra of Eu 2+ -doped KBaBP 2 O 8 and in the case when K is partly substituted by Li.
  • FIG. 10 shows emission spectra of Eu 2+ -doped KBaBP 2 O 8 and in the case when Ba is partly substituted by Zn.

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US13/881,522 2010-10-26 2011-10-19 Borophosphate phosphor and light source Expired - Fee Related US8858836B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP10188834.5 2010-10-26
EP10188834A EP2447338B1 (de) 2010-10-26 2010-10-26 Borophosphatphosphor und Lichtquelle
EP10188834 2010-10-26
PCT/EP2011/068226 WO2012055729A1 (en) 2010-10-26 2011-10-19 Borophosphate phosphor and light source

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EP (1) EP2447338B1 (de)
JP (3) JP5848354B2 (de)
KR (1) KR20140015268A (de)
CN (1) CN103237867B (de)
MY (1) MY153068A (de)
RU (1) RU2583023C2 (de)
TW (1) TWI491708B (de)
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US11006493B1 (en) * 2018-05-29 2021-05-11 Juganu Ltd. Lighting systems for general illumination and disinfection
US11391439B2 (en) * 2018-05-29 2022-07-19 Juganu Ltd. Lighting systems for general illumination and disinfection

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